I'm sure most of this has been covered.
I've been finishing up here. Keeping Fasttech in business buying coil heads. I already have 2 gallon bags or so of mostly Kanger and Aspire tanks. Another one halfway full of cheap RDA's. Two full of various coil heads.
Another one of building supplies, even though wire is one of the things the FDA can't touch. All of these wires are used for other applications in much greater quantity. Vaping can't account for more than a small percentage of Kanthal, for example. Very popular in jewelry making.
I bought a gallon of 100mg nic base. 100VG, salt nicotine.
I also have over 200 cartos, and I know how to make them rival RDA's. Probably not as well as Kat, but I'm good with them. I can keep one going for a couple of weeks or more. Coil heads and cartos last a long time, with my 1% flavor.
Batteries are off limits, too. 18650 flashlights are quite popular. I live in search and rescue central. S&R volunteers, hunters, campers,, hikers, etc are much more serious about flashlights than we are, and many use 18650 flashlights. Not to mention law enforcement. I personally have flashlights in 18650, 18500, and 18350 (we keep one of those in the car--it can light up a room pretty brightly).
5 regulated mods that are used mostly as test fixtures. A few pass through devices (semi mechs?), and several dozen mechs. I bought a few more Melo 3 series tanks, partly because the coil heads are cheap, and partly because they rock. I bought all 6 colors of Joyetech ProCore Air Plus tanks, even though the coil heads are relatively expensive. Which I also bought a few boxes of.
I've had a severe case of shinyitis, fueled by the knowledge that some of these things may be going away for good.